Server Confusion

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http://www.unix.com – I don't even know where to start with this one. There is so much out there about different aspects of this. I am starting with a basic Ubuntu 11.04 install. Do I need to configure a DNS? I am a little confused about that. What do I need to do for a domain name? I have followed various tutorials, but am still confused. If anyone has an overall explanation of the steps here, I would be appreciative. 1. The problem statement, all variables and given/known data: Purpose: The purpose of this assignment is to familiarize the student with the working of an internet email system. A working email (HowTos)